TY - JOUR
T1 - Effects of phosphodiesterase type 5 inhibitor, tadalafil, on continence reflex in rats
AU - Izumi, Hideaki
AU - Kaiho, Yasuhiro
AU - Miyazato, Minoru
AU - Kawamorita, Naoki
AU - Nakagawa, Haruo
AU - Arai, Yoichi
N1 - Funding Information:
Acknowledgments This work was supported by Japan Society for the Promotion of Science KAKENHI Grant Number 23650317.
Publisher Copyright:
© 2014, The International Urogynecological Association.
PY - 2014/11/18
Y1 - 2014/11/18
N2 - Introduction and hypothesis: Effects of tadalafil, a phosphodiesterase type 5 inhibitor, on the urethral continence reflex induced by sneezing were investigated.Methods: The amplitude of urethral pressure responses during sneezing (A-URS) and urethral baseline pressure (UBP) were measured in female rats using a microtransducer-tipped catheter. Sneeze leak-point pressure (S-LPP), defined as the lowest amount of pressure required to induce fluid leakage from the urethral orifice during sneezing, was measured in rats with stress urinary incontinence (SUI) induced by vaginal distension. Values were determined before and after tadalafil administration.Results: Tadalafil dose dependently and significantly decreased A-URS and S-LPP. At the highest dose tested (6.0 mg/kg), A-URS and S-LPP decreased from 49.7 to 32.3 and from 63.9 to 44.2 cmH2O, respectively, whereas UBP did not significantly change.Conclusions: Tadalafil attenuated the sneeze-induced urethral continence reflex by relaxing the striated muscles of the external urethral sphincter.
AB - Introduction and hypothesis: Effects of tadalafil, a phosphodiesterase type 5 inhibitor, on the urethral continence reflex induced by sneezing were investigated.Methods: The amplitude of urethral pressure responses during sneezing (A-URS) and urethral baseline pressure (UBP) were measured in female rats using a microtransducer-tipped catheter. Sneeze leak-point pressure (S-LPP), defined as the lowest amount of pressure required to induce fluid leakage from the urethral orifice during sneezing, was measured in rats with stress urinary incontinence (SUI) induced by vaginal distension. Values were determined before and after tadalafil administration.Results: Tadalafil dose dependently and significantly decreased A-URS and S-LPP. At the highest dose tested (6.0 mg/kg), A-URS and S-LPP decreased from 49.7 to 32.3 and from 63.9 to 44.2 cmH2O, respectively, whereas UBP did not significantly change.Conclusions: Tadalafil attenuated the sneeze-induced urethral continence reflex by relaxing the striated muscles of the external urethral sphincter.
KW - Smooth muscle
KW - Sneeze
KW - Stress urinary incontinence
KW - Striated muscle
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U2 - 10.1007/s00192-014-2453-3
DO - 10.1007/s00192-014-2453-3
M3 - Article
C2 - 24988889
AN - SCOPUS:84911805554
SN - 0937-3462
VL - 25
SP - 1721
EP - 1727
JO - International Urogynecology Journal
JF - International Urogynecology Journal
IS - 12
ER -